Water-tube boiler



(No Model.)

W. S. BLACK. WATER TUBE BOILER.

No. 430,914. Patented June 24, 1890.

IN VE N T 0l?.

NMS LWYQEY WlTA/ESSES UNITED STATES PATENT OFFICE. t

VILLIAM SUMTER BLACK, OF BALTIMORE, MARYLAND.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 430,914, dated J une 24, 1890.

Application led Marsh 10, 1890.

To all whom t may concern;

' Be it known that I, VILLIAM SUMTER BLACK,-a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented new and useful Improvements in Tater-Tube Boilers, of which the following is a specification.

My invention is directed to improvements in steam-generators in which the water is caused to circulate through the tubes instead of the products of combustion; and the object of my improvement is to provide a construction of such boiler in which the steamcontaining cylinder is formed as ahorizoutal elongation or extension of the inclined watertubes, whereby the lat-ter are caused to open directly into the steam-chamber to eiect a quick liberation of the steam generated Vin the inclined tubes directly into the said chamber, wherein the water is maintained only as a circulating body. Y

My improved steam-generator provides a mud-drum at one end of the inclined watertubes and a horizontal chamber for the steam at the upper ends of the said tubes; and it provides an external water-circulation direct from the steam-containing chamber to the mud-drum; and it provides a construction in which the generator comprises Vin one body the inclined water-tubes capped at one end by a mud-drum and at the other end by a horizontal steam-containing chamber, whereby the construction is rendered compact and the steam delivered directly fromv the tubehead into the steam-space, which caps it, and thereby insures a rapid and continuous water-circulation through the inclined steamgenerating tubes. These are the features which distinguish my invention from watertube boilers in which a separate steam-boiler is provided for containing the steam.

The accompanying drawings illustrate my improved steam-gen erator, and in which Figure l represents the generator in vertical longitudinal section. Fig. 2 represents the generator in elevation as set up in a brick furnace. Fig. 3 shows the front end of the same with the front casing-plate removed. Fig. 4: is a front end View of the same. Fig. 5 is a rear end view of the generator, showing a single water-circulating pipe; and Fie. 6 is Serial No. 343,318. (No model.)

a similar view showing three water-circulatingpipes.

The water-tubes a are grouped so as to form, when set, an inclined cylindrical body, with spaces between them for the passage of the flame from the furnace. They can be made of any suitable diameter and length, and are arranged in straight rows horizontally staggered in rows vertically, so that the iiames completely envelope the entire surface of the tubes, and they are connected at vtheir ends by tube-heads b, to which they are secured by i'langin g or beading their ends to the heads in a manner well understood in tubular boiler making. One of these tube-heads is capped by a semi-globular or hemispherical cap o", and the other tube-head is secured to a cylindrical section c, standing in the line of the inclined body of tubes, and to which is secured .a cylindrical section d, standing in a plane horizontal to the inclination of the tubes and capped by a semi-globular or hemispherical cap c, which forms the front end of the boiler and stands out from the brick-setting, as in Fig.

2. These several sections are preferably lapf jointed with each other and with the tubeheads, and rivet-ed as in boiler-making. The cap at the lower tube-plate forms the muddrum, and the connected sections at the upper tube -head form the steam-chamber f, which extends from the tube-head to the front cap. The hemispherical caps may be made of segments riveted to a cast-iron manhole ring g in the center, or in boilers of small size these caps may be cast in one piece with man-holes. These man-holes are closed by suitable covers and afford access to the interior of the boiler for cleaning and removing and renewing water-tubes, if necessary.

The circulation of the water through the boilers is maintained by means of external pipes h, which enter a nozzled opening in the lower' mud-cap, and a nozzled opening in the lower side of the middle section of the steamchamber, and these pipes may be arranged so as to pass down through the brick-setting on each side of the boiler, as in Figs. 2 and 3, or there may be a single pipe extending under the boiler, as in Fig. 5, or there may be three pipes, arranged as in Fig. 6. For large boilers regular boiler-dues will be used; but for IOO small boilers these pipes will be of large-size lap-welded gas-pipey with standard fittings at the bend joined by screwing together, and these pipes may be connected to the boiler ends by cast-iron or annealed rings. The necessary elbows in these pipes may be formed by a casting t', having a hand-hole plate or cap j in its front end for cleaning. These elbows are provided with feed-water pipes 7c, whereby the feed-waterbeing introduced into the boiler through the external circulationpipes is raised in temperature in passing through said pipes to the boiler. At the bottom ot' the. mud-cap and at the bottom of the upper cylindrical section I provide blow-pipes for blowing out the solid matter which may collect therein.

The boiler is set in the furnace at about an 'angle of seventeen to forty degrees, to suit the space where the boiler is to be set, with the fire-grate Z under its upper part, so `that the course of the fire is upward between the water-tubes, over the first flame-plate m, thence downward around the tubes and under the second flame-plate n, and then upward around the tubes to the smoke-flue. The furnace has the usual iiue-chambencleaning doors, special doors for cleaning the outsides of the water-tubes, and the boiler has all the provisions required and used in steamgenerators. The front projecting cap is covered with a shield w, so as to form an airspace to protect the outside projecting boiler end from contact with the air and to retain its uniform temperature. The middle steamchamber-formin g section has the steam-dome fr, and the water in the steam-chamber stands on-about a level with the highest part of the upper tube-head, so that the steam rising in the tubes at the rear end of the boiler-body enters the steam-space at the front end of the same boiler-body, thereby giving a more rapid and consequently a stronger circulation to the water and a comparatively short passage for the steam-bubbles, facilitating the generation of steam and preventing thev incrustation within the boiler. This construction also provides for keeping the upper tube-head covered with Water, so that the upper portions of the tubes will be protected by a perfeet water-circulation.

I claim as my improvement p l. The combination, in a steam-generator, of the inclined tubular body having its lower end capped by a hemispherical cap and terminating at its upperend in a body composed of a cylindrical section standing in line'with the tubes, and a cylindrical section standing in a line horizontal to said inclined section and capped by a hemispherical body, with external pipes connecting the two ends of the generator, substantially as described.

2. The combination,in a water-tube boiler, of an inclined tubular body the tubes whereof are connected to flanged heads b, a hemispherical cap connected to the lower flanged head, a cylindrical section c, connected to the;

upper flanged head in line with said tubular body, and a horizontal section d, connected to and extending in line with said section c, with the circulating-pipes h, connectingv the lower cap and the said section d, and the feed-water pipes 7a, entering said pipes 71l at their ends, connecting the said section d, silbstantially as described, for the purpose specified.

3. The combination of a steam -generator composed of an inclined rear water-tube body terminating in a horizontal front water and steam chamber capped by a front projecting hemispherical cap, with a shield for said cap, forming an intervening air-space, for the purpose stated.

In testimony whereof I have hereunto set my i hand in the presence of two subscribing witnesses.

WILLIAM SUMTER BLACK. Witnesses:

FELIX R. SULLIVAN, GEOJE. SAVILLE. 

